The pull rod is screwed into the insidethread of the anchor head.
这是钻杆丝扣油，不能用在钻铤丝扣上。
2
It is introduced that manufacturing principle of insidethread copper pipe-for the Heat Exchange Element of air condition.
简单介绍了空调器热交换元件——内螺纹铜管的制造原理。
3
It is also introduced that typical thread form and performance as well as the production status and developing prospect of insidethread copper pipe abroad and at home.